﻿/*!
* jQuery BBQ: Back Button & Query Library - v1.2.1 - 2/17/2010
* http://benalman.com/projects/jquery-bbq-plugin/
* 
* Copyright (c) 2010 "Cowboy" Ben Alman
* Dual licensed under the MIT and GPL licenses.
* http://benalman.com/about/license/
*/

// Script: jQuery BBQ: Back Button & Query Library
//
// *Version: 1.2.1, Last updated: 2/17/2010*
// 
// Project Home - http://benalman.com/projects/jquery-bbq-plugin/
// GitHub       - http://github.com/cowboy/jquery-bbq/
// Source       - http://github.com/cowboy/jquery-bbq/raw/master/jquery.ba-bbq.js
// (Minified)   - http://github.com/cowboy/jquery-bbq/raw/master/jquery.ba-bbq.min.js (4.0kb)
// 
// About: License
// 
// Copyright (c) 2010 "Cowboy" Ben Alman,
// Dual licensed under the MIT and GPL licenses.
// http://benalman.com/about/license/
// 
// About: Examples
// 
// These working examples, complete with fully commented code, illustrate a few
// ways in which this plugin can be used.
// 
// Basic AJAX     - http://benalman.com/code/projects/jquery-bbq/examples/fragment-basic/
// Advanced AJAX  - http://benalman.com/code/projects/jquery-bbq/examples/fragment-advanced/
// jQuery UI Tabs - http://benalman.com/code/projects/jquery-bbq/examples/fragment-jquery-ui-tabs/
// Deparam        - http://benalman.com/code/projects/jquery-bbq/examples/deparam/
// 
// About: Support and Testing
// 
// Information about what version or versions of jQuery this plugin has been
// tested with, what browsers it has been tested in, and where the unit tests
// reside (so you can test it yourself).
// 
// jQuery Versions - 1.3.2, 1.4.1, 1.4.2
// Browsers Tested - Internet Explorer 6-8, Firefox 2-3.7, Safari 3-4,
//                   Chrome 4-5, Opera 9.6-10.1.
// Unit Tests      - http://benalman.com/code/projects/jquery-bbq/unit/
// 
// About: Release History
// 
// 1.2.1 - (2/17/2010) Actually fixed the stale window.location Safari bug from
//         <jQuery hashchange event> in BBQ, which was the main reason for the
//         previous release!
// 1.2   - (2/16/2010) Integrated <jQuery hashchange event> v1.2, which fixes a
//         Safari bug, the event can now be bound before DOM ready, and IE6/7
//         page should no longer scroll when the event is first bound. Also
//         added the <jQuery.param.fragment.noEscape> method, and reworked the
//         <hashchange event (BBQ)> internal "add" method to be compatible with
//         changes made to the jQuery 1.4.2 special events API.
// 1.1.1 - (1/22/2010) Integrated <jQuery hashchange event> v1.1, which fixes an
//         obscure IE8 EmulateIE7 meta tag compatibility mode bug.
// 1.1   - (1/9/2010) Broke out the jQuery BBQ event.special <hashchange event>
//         functionality into a separate plugin for users who want just the
//         basic event & back button support, without all the extra awesomeness
//         that BBQ provides. This plugin will be included as part of jQuery BBQ,
//         but also be available separately. See <jQuery hashchange event>
//         plugin for more information. Also added the <jQuery.bbq.removeState>
//         method and added additional <jQuery.deparam> examples.
// 1.0.3 - (12/2/2009) Fixed an issue in IE 6 where location.search and
//         location.hash would report incorrectly if the hash contained the ?
//         character. Also <jQuery.param.querystring> and <jQuery.param.fragment>
//         will no longer parse params out of a URL that doesn't contain ? or #,
//         respectively.
// 1.0.2 - (10/10/2009) Fixed an issue in IE 6/7 where the hidden IFRAME caused
//         a "This page contains both secure and nonsecure items." warning when
//         used on an https:// page.
// 1.0.1 - (10/7/2009) Fixed an issue in IE 8. Since both "IE7" and "IE8
//         Compatibility View" modes erroneously report that the browser
//         supports the native window.onhashchange event, a slightly more
//         robust test needed to be added.
// 1.0   - (10/2/2009) Initial release

(function ($, window) {
    '$:nomunge'; // Used by YUI compressor.

    // Some convenient shortcuts.
    var undefined,
    aps = Array.prototype.slice,
    decode = decodeURIComponent,

    // Method / object references.
    jq_param = $.param,
    jq_param_fragment,
    jq_deparam,
    jq_deparam_fragment,
    jq_bbq = $.bbq = $.bbq || {},
    jq_bbq_pushState,
    jq_bbq_getState,
    jq_elemUrlAttr,
    jq_event_special = $.event.special,

    // Reused strings.
    str_hashchange = 'hashchange',
    str_querystring = 'querystring',
    str_fragment = 'fragment',
    str_elemUrlAttr = 'elemUrlAttr',
    str_location = 'location',
    str_href = 'href',
    str_src = 'src',

    // Reused RegExp.
    re_trim_querystring = /^.*\?|#.*$/g,
    re_trim_fragment = /^.*\#/,
    re_no_escape,

    // Used by jQuery.elemUrlAttr.
    elemUrlAttr_cache = {};

    // A few commonly used bits, broken out to help reduce minified file size.

    function is_string(arg) {
        return typeof arg === 'string';
    };

    // Why write the same function twice? Let's curry! Mmmm, curry..

    function curry(func) {
        var args = aps.call(arguments, 1);

        return function () {
            return func.apply(this, args.concat(aps.call(arguments)));
        };
    };

    // Get location.hash (or what you'd expect location.hash to be) sans any
    // leading #. Thanks for making this necessary, Firefox!
    function get_fragment(url) {
        return url.replace(/^[^#]*#?(.*)$/, '$1');
    };

    // Get location.search (or what you'd expect location.search to be) sans any
    // leading #. Thanks for making this necessary, IE6!
    function get_querystring(url) {
        return url.replace(/(?:^[^?#]*\?([^#]*).*$)?.*/, '$1');
    };

    // Section: Param (to string)
    // 
    // Method: jQuery.param.querystring
    // 
    // Retrieve the query string from a URL or if no arguments are passed, the
    // current window.location.
    // 
    // Usage:
    // 
    // > jQuery.param.querystring( [ url ] );
    // 
    // Arguments:
    // 
    //  url - (String) A URL containing query string params to be parsed. If url
    //    is not passed, the current window.location is used.
    // 
    // Returns:
    // 
    //  (String) The parsed query string, with any leading "?" removed.
    //

    // Method: jQuery.param.querystring (build url)
    // 
    // Merge a URL, with or without pre-existing query string params, plus any
    // object, params string or URL containing query string params into a new URL.
    // 
    // Usage:
    // 
    // > jQuery.param.querystring( url, params [, merge_mode ] );
    // 
    // Arguments:
    // 
    //  url - (String) A valid URL for params to be merged into. This URL may
    //    contain a query string and/or fragment (hash).
    //  params - (String) A params string or URL containing query string params to
    //    be merged into url.
    //  params - (Object) A params object to be merged into url.
    //  merge_mode - (Number) Merge behavior defaults to 0 if merge_mode is not
    //    specified, and is as-follows:
    // 
    //    * 0: params in the params argument will override any query string
    //         params in url.
    //    * 1: any query string params in url will override params in the params
    //         argument.
    //    * 2: params argument will completely replace any query string in url.
    // 
    // Returns:
    // 
    //  (String) Either a params string with urlencoded data or a URL with a
    //    urlencoded query string in the format 'a=b&c=d&e=f'.

    // Method: jQuery.param.fragment
    // 
    // Retrieve the fragment (hash) from a URL or if no arguments are passed, the
    // current window.location.
    // 
    // Usage:
    // 
    // > jQuery.param.fragment( [ url ] );
    // 
    // Arguments:
    // 
    //  url - (String) A URL containing fragment (hash) params to be parsed. If
    //    url is not passed, the current window.location is used.
    // 
    // Returns:
    // 
    //  (String) The parsed fragment (hash) string, with any leading "#" removed.

    // Method: jQuery.param.fragment (build url)
    // 
    // Merge a URL, with or without pre-existing fragment (hash) params, plus any
    // object, params string or URL containing fragment (hash) params into a new
    // URL.
    // 
    // Usage:
    // 
    // > jQuery.param.fragment( url, params [, merge_mode ] );
    // 
    // Arguments:
    // 
    //  url - (String) A valid URL for params to be merged into. This URL may
    //    contain a query string and/or fragment (hash).
    //  params - (String) A params string or URL containing fragment (hash) params
    //    to be merged into url.
    //  params - (Object) A params object to be merged into url.
    //  merge_mode - (Number) Merge behavior defaults to 0 if merge_mode is not
    //    specified, and is as-follows:
    // 
    //    * 0: params in the params argument will override any fragment (hash)
    //         params in url.
    //    * 1: any fragment (hash) params in url will override params in the
    //         params argument.
    //    * 2: params argument will completely replace any query string in url.
    // 
    // Returns:
    // 
    //  (String) Either a params string with urlencoded data or a URL with a
    //    urlencoded fragment (hash) in the format 'a=b&c=d&e=f'.

    function jq_param_sub(is_fragment, get_func, url, params, merge_mode) {
        var result,
      qs,
      matches,
      url_params,
      hash;

        if (params !== undefined) {
            // Build URL by merging params into url string.

            // matches[1] = url part that precedes params, not including trailing ?/#
            // matches[2] = params, not including leading ?/#
            // matches[3] = if in 'querystring' mode, hash including leading #, otherwise ''
            matches = url.match(is_fragment ? /^([^#]*)\#?(.*)$/ : /^([^#?]*)\??([^#]*)(#?.*)/);

            // Get the hash if in 'querystring' mode, and it exists.
            hash = matches[3] || '';

            if (merge_mode === 2 && is_string(params)) {
                // If merge_mode is 2 and params is a string, merge the fragment / query
                // string into the URL wholesale, without converting it into an object.
                qs = params.replace(is_fragment ? re_trim_fragment : re_trim_querystring, '');

            } else {
                // Convert relevant params in url to object.
                url_params = jq_deparam(matches[2]);

                params = is_string(params)

                // Convert passed params string into object.
          ? jq_deparam[is_fragment ? str_fragment : str_querystring](params)

                // Passed params object.
          : params;

                qs = merge_mode === 2 ? params                              // passed params replace url params
          : merge_mode === 1 ? $.extend({}, params, url_params)  // url params override passed params
          : $.extend({}, url_params, params);                     // passed params override url params

                // Convert params object to a string.
                qs = jq_param(qs);

                // Unescape characters specified via $.param.noEscape. Since only hash-
                // history users have requested this feature, it's only enabled for
                // fragment-related params strings.
                if (is_fragment) {
                    qs = qs.replace(re_no_escape, decode);
                }
            }

            // Build URL from the base url, querystring and hash. In 'querystring'
            // mode, ? is only added if a query string exists. In 'fragment' mode, #
            // is always added.
            result = matches[1] + (is_fragment ? '#' : qs || !matches[1] ? '?' : '') + qs + hash;

        } else {
            // If URL was passed in, parse params from URL string, otherwise parse
            // params from window.location.
            result = get_func(url !== undefined ? url : window[str_location][str_href]);
        }

        return result;
    };

    jq_param[str_querystring] = curry(jq_param_sub, 0, get_querystring);
    jq_param[str_fragment] = jq_param_fragment = curry(jq_param_sub, 1, get_fragment);

    // Method: jQuery.param.fragment.noEscape
    // 
    // Specify characters that will be left unescaped when fragments are created
    // or merged using <jQuery.param.fragment>, or when the fragment is modified
    // using <jQuery.bbq.pushState>. This option only applies to serialized data
    // object fragments, and not set-as-string fragments. Does not affect the
    // query string. Defaults to ",/" (comma, forward slash).
    // 
    // Note that this is considered a purely aesthetic option, and will help to
    // create URLs that "look pretty" in the address bar or bookmarks, without
    // affecting functionality in any way. That being said, be careful to not
    // unescape characters that are used as delimiters or serve a special
    // purpose, such as the "#?&=+" (octothorpe, question mark, ampersand,
    // equals, plus) characters.
    // 
    // Usage:
    // 
    // > jQuery.param.fragment.noEscape( [ chars ] );
    // 
    // Arguments:
    // 
    //  chars - (String) The characters to not escape in the fragment. If
    //    unspecified, defaults to empty string (escape all characters).
    // 
    // Returns:
    // 
    //  Nothing.

    jq_param_fragment.noEscape = function (chars) {
        chars = chars || '';
        var arr = $.map(chars.split(''), encodeURIComponent);
        re_no_escape = new RegExp(arr.join('|'), 'g');
    };

    // A sensible default. These are the characters people seem to complain about
    // "uglifying up the URL" the most.
    jq_param_fragment.noEscape(',/');

    // Section: Deparam (from string)
    // 
    // Method: jQuery.deparam
    // 
    // Deserialize a params string into an object, optionally coercing numbers,
    // booleans, null and undefined values; this method is the counterpart to the
    // internal jQuery.param method.
    // 
    // Usage:
    // 
    // > jQuery.deparam( params [, coerce ] );
    // 
    // Arguments:
    // 
    //  params - (String) A params string to be parsed.
    //  coerce - (Boolean) If true, coerces any numbers or true, false, null, and
    //    undefined to their actual value. Defaults to false if omitted.
    // 
    // Returns:
    // 
    //  (Object) An object representing the deserialized params string.

    $.deparam = jq_deparam = function (params, coerce) {
        var obj = {},
      coerce_types = { 'true': !0, 'false': !1, 'null': null };

        // Iterate over all name=value pairs.
        $.each(params.replace(/\+/g, ' ').split('&'), function (j, v) {
            var param = v.split('='),
        key = decode(param[0]),
        val,
        cur = obj,
        i = 0,

            // If key is more complex than 'foo', like 'a[]' or 'a[b][c]', split it
            // into its component parts.
        keys = key.split(']['),
        keys_last = keys.length - 1;

            // If the first keys part contains [ and the last ends with ], then []
            // are correctly balanced.
            if (/\[/.test(keys[0]) && /\]$/.test(keys[keys_last])) {
                // Remove the trailing ] from the last keys part.
                keys[keys_last] = keys[keys_last].replace(/\]$/, '');

                // Split first keys part into two parts on the [ and add them back onto
                // the beginning of the keys array.
                keys = keys.shift().split('[').concat(keys);

                keys_last = keys.length - 1;
            } else {
                // Basic 'foo' style key.
                keys_last = 0;
            }

            // Are we dealing with a name=value pair, or just a name?
            if (param.length === 2) {
                val = decode(param[1]);

                // Coerce values.
                if (coerce) {
                    val = val && !isNaN(val) ? +val              // number
            : val === 'undefined' ? undefined         // undefined
            : coerce_types[val] !== undefined ? coerce_types[val] // true, false, null
            : val;                                                // string
                }

                if (keys_last) {
                    // Complex key, build deep object structure based on a few rules:
                    // * The 'cur' pointer starts at the object top-level.
                    // * [] = array push (n is set to array length), [n] = array if n is 
                    //   numeric, otherwise object.
                    // * If at the last keys part, set the value.
                    // * For each keys part, if the current level is undefined create an
                    //   object or array based on the type of the next keys part.
                    // * Move the 'cur' pointer to the next level.
                    // * Rinse & repeat.
                    for (; i <= keys_last; i++) {
                        key = keys[i] === '' ? cur.length : keys[i];
                        cur = cur[key] = i < keys_last
              ? cur[key] || (keys[i + 1] && isNaN(keys[i + 1]) ? {} : [])
              : val;
                    }

                } else {
                    // Simple key, even simpler rules, since only scalars and shallow
                    // arrays are allowed.

                    if ($.isArray(obj[key])) {
                        // val is already an array, so push on the next value.
                        obj[key].push(val);

                    } else if (obj[key] !== undefined) {
                        // val isn't an array, but since a second value has been specified,
                        // convert val into an array.
                        obj[key] = [obj[key], val];

                    } else {
                        // val is a scalar.
                        obj[key] = val;
                    }
                }

            } else if (key) {
                // No value was defined, so set something meaningful.
                obj[key] = coerce
          ? undefined
          : '';
            }
        });

        return obj;
    };

    // Method: jQuery.deparam.querystring
    // 
    // Parse the query string from a URL or the current window.location,
    // deserializing it into an object, optionally coercing numbers, booleans,
    // null and undefined values.
    // 
    // Usage:
    // 
    // > jQuery.deparam.querystring( [ url ] [, coerce ] );
    // 
    // Arguments:
    // 
    //  url - (String) An optional params string or URL containing query string
    //    params to be parsed. If url is omitted, the current window.location
    //    is used.
    //  coerce - (Boolean) If true, coerces any numbers or true, false, null, and
    //    undefined to their actual value. Defaults to false if omitted.
    // 
    // Returns:
    // 
    //  (Object) An object representing the deserialized params string.

    // Method: jQuery.deparam.fragment
    // 
    // Parse the fragment (hash) from a URL or the current window.location,
    // deserializing it into an object, optionally coercing numbers, booleans,
    // null and undefined values.
    // 
    // Usage:
    // 
    // > jQuery.deparam.fragment( [ url ] [, coerce ] );
    // 
    // Arguments:
    // 
    //  url - (String) An optional params string or URL containing fragment (hash)
    //    params to be parsed. If url is omitted, the current window.location
    //    is used.
    //  coerce - (Boolean) If true, coerces any numbers or true, false, null, and
    //    undefined to their actual value. Defaults to false if omitted.
    // 
    // Returns:
    // 
    //  (Object) An object representing the deserialized params string.

    function jq_deparam_sub(is_fragment, url_or_params, coerce) {
        if (url_or_params === undefined || typeof url_or_params === 'boolean') {
            // url_or_params not specified.
            coerce = url_or_params;
            url_or_params = jq_param[is_fragment ? str_fragment : str_querystring]();
        } else {
            url_or_params = is_string(url_or_params)
        ? url_or_params.replace(is_fragment ? re_trim_fragment : re_trim_querystring, '')
        : url_or_params;
        }

        return jq_deparam(url_or_params, coerce);
    };

    jq_deparam[str_querystring] = curry(jq_deparam_sub, 0);
    jq_deparam[str_fragment] = jq_deparam_fragment = curry(jq_deparam_sub, 1);

    // Section: Element manipulation
    // 
    // Method: jQuery.elemUrlAttr
    // 
    // Get the internal "Default URL attribute per tag" list, or augment the list
    // with additional tag-attribute pairs, in case the defaults are insufficient.
    // 
    // In the <jQuery.fn.querystring> and <jQuery.fn.fragment> methods, this list
    // is used to determine which attribute contains the URL to be modified, if
    // an "attr" param is not specified.
    // 
    // Default Tag-Attribute List:
    // 
    //  a      - href
    //  base   - href
    //  iframe - src
    //  img    - src
    //  input  - src
    //  form   - action
    //  link   - href
    //  script - src
    // 
    // Usage:
    // 
    // > jQuery.elemUrlAttr( [ tag_attr ] );
    // 
    // Arguments:
    // 
    //  tag_attr - (Object) An object containing a list of tag names and their
    //    associated default attribute names in the format { tag: 'attr', ... } to
    //    be merged into the internal tag-attribute list.
    // 
    // Returns:
    // 
    //  (Object) An object containing all stored tag-attribute values.

    // Only define function and set defaults if function doesn't already exist, as
    // the urlInternal plugin will provide this method as well.
    $[str_elemUrlAttr] || ($[str_elemUrlAttr] = function (obj) {
        return $.extend(elemUrlAttr_cache, obj);
    })({
        a: str_href,
        base: str_href,
        iframe: str_src,
        img: str_src,
        input: str_src,
        form: 'action',
        link: str_href,
        script: str_src
    });

    jq_elemUrlAttr = $[str_elemUrlAttr];

    // Method: jQuery.fn.querystring
    // 
    // Update URL attribute in one or more elements, merging the current URL (with
    // or without pre-existing query string params) plus any params object or
    // string into a new URL, which is then set into that attribute. Like
    // <jQuery.param.querystring (build url)>, but for all elements in a jQuery
    // collection.
    // 
    // Usage:
    // 
    // > jQuery('selector').querystring( [ attr, ] params [, merge_mode ] );
    // 
    // Arguments:
    // 
    //  attr - (String) Optional name of an attribute that will contain a URL to
    //    merge params or url into. See <jQuery.elemUrlAttr> for a list of default
    //    attributes.
    //  params - (Object) A params object to be merged into the URL attribute.
    //  params - (String) A URL containing query string params, or params string
    //    to be merged into the URL attribute.
    //  merge_mode - (Number) Merge behavior defaults to 0 if merge_mode is not
    //    specified, and is as-follows:
    //    
    //    * 0: params in the params argument will override any params in attr URL.
    //    * 1: any params in attr URL will override params in the params argument.
    //    * 2: params argument will completely replace any query string in attr
    //         URL.
    // 
    // Returns:
    // 
    //  (jQuery) The initial jQuery collection of elements, but with modified URL
    //  attribute values.

    // Method: jQuery.fn.fragment
    // 
    // Update URL attribute in one or more elements, merging the current URL (with
    // or without pre-existing fragment/hash params) plus any params object or
    // string into a new URL, which is then set into that attribute. Like
    // <jQuery.param.fragment (build url)>, but for all elements in a jQuery
    // collection.
    // 
    // Usage:
    // 
    // > jQuery('selector').fragment( [ attr, ] params [, merge_mode ] );
    // 
    // Arguments:
    // 
    //  attr - (String) Optional name of an attribute that will contain a URL to
    //    merge params into. See <jQuery.elemUrlAttr> for a list of default
    //    attributes.
    //  params - (Object) A params object to be merged into the URL attribute.
    //  params - (String) A URL containing fragment (hash) params, or params
    //    string to be merged into the URL attribute.
    //  merge_mode - (Number) Merge behavior defaults to 0 if merge_mode is not
    //    specified, and is as-follows:
    //    
    //    * 0: params in the params argument will override any params in attr URL.
    //    * 1: any params in attr URL will override params in the params argument.
    //    * 2: params argument will completely replace any fragment (hash) in attr
    //         URL.
    // 
    // Returns:
    // 
    //  (jQuery) The initial jQuery collection of elements, but with modified URL
    //  attribute values.

    function jq_fn_sub(mode, force_attr, params, merge_mode) {
        if (!is_string(params) && typeof params !== 'object') {
            // force_attr not specified.
            merge_mode = params;
            params = force_attr;
            force_attr = undefined;
        }

        return this.each(function () {
            var that = $(this),

            // Get attribute specified, or default specified via $.elemUrlAttr.
        attr = force_attr || jq_elemUrlAttr()[(this.nodeName || '').toLowerCase()] || '',

            // Get URL value.
        url = attr && that.attr(attr) || '';

            // Update attribute with new URL.
            that.attr(attr, jq_param[mode](url, params, merge_mode));
        });

    };

    $.fn[str_querystring] = curry(jq_fn_sub, str_querystring);
    $.fn[str_fragment] = curry(jq_fn_sub, str_fragment);

    // Section: History, hashchange event
    // 
    // Method: jQuery.bbq.pushState
    // 
    // Adds a 'state' into the browser history at the current position, setting
    // location.hash and triggering any bound <hashchange event> callbacks
    // (provided the new state is different than the previous state).
    // 
    // If no arguments are passed, an empty state is created, which is just a
    // shortcut for jQuery.bbq.pushState( {}, 2 ).
    // 
    // Usage:
    // 
    // > jQuery.bbq.pushState( [ params [, merge_mode ] ] );
    // 
    // Arguments:
    // 
    //  params - (String) A serialized params string or a hash string beginning
    //    with # to merge into location.hash.
    //  params - (Object) A params object to merge into location.hash.
    //  merge_mode - (Number) Merge behavior defaults to 0 if merge_mode is not
    //    specified (unless a hash string beginning with # is specified, in which
    //    case merge behavior defaults to 2), and is as-follows:
    // 
    //    * 0: params in the params argument will override any params in the
    //         current state.
    //    * 1: any params in the current state will override params in the params
    //         argument.
    //    * 2: params argument will completely replace current state.
    // 
    // Returns:
    // 
    //  Nothing.
    // 
    // Additional Notes:
    // 
    //  * Setting an empty state may cause the browser to scroll.
    //  * Unlike the fragment and querystring methods, if a hash string beginning
    //    with # is specified as the params agrument, merge_mode defaults to 2.

    jq_bbq.pushState = jq_bbq_pushState = function (params, merge_mode) {
        if (is_string(params) && /^#/.test(params) && merge_mode === undefined) {
            // Params string begins with # and merge_mode not specified, so completely
            // overwrite window.location.hash.
            merge_mode = 2;
        }

        var has_args = params !== undefined,
        // Merge params into window.location using $.param.fragment.
      url = jq_param_fragment(window[str_location][str_href],
        has_args ? params : {}, has_args ? merge_mode : 2);

        // Set new window.location.href. If hash is empty, use just # to prevent
        // browser from reloading the page. Note that Safari 3 & Chrome barf on
        // location.hash = '#'.
        window[str_location][str_href] = url + (/#/.test(url) ? '' : '#');
    };

    // Method: jQuery.bbq.getState
    // 
    // Retrieves the current 'state' from the browser history, parsing
    // location.hash for a specific key or returning an object containing the
    // entire state, optionally coercing numbers, booleans, null and undefined
    // values.
    // 
    // Usage:
    // 
    // > jQuery.bbq.getState( [ key ] [, coerce ] );
    // 
    // Arguments:
    // 
    //  key - (String) An optional state key for which to return a value.
    //  coerce - (Boolean) If true, coerces any numbers or true, false, null, and
    //    undefined to their actual value. Defaults to false.
    // 
    // Returns:
    // 
    //  (Anything) If key is passed, returns the value corresponding with that key
    //    in the location.hash 'state', or undefined. If not, an object
    //    representing the entire 'state' is returned.

    jq_bbq.getState = jq_bbq_getState = function (key, coerce) {
        return key === undefined || typeof key === 'boolean'
      ? jq_deparam_fragment(key) // 'key' really means 'coerce' here
      : jq_deparam_fragment(coerce)[key];
    };

    // Method: jQuery.bbq.removeState
    // 
    // Remove one or more keys from the current browser history 'state', creating
    // a new state, setting location.hash and triggering any bound
    // <hashchange event> callbacks (provided the new state is different than
    // the previous state).
    // 
    // If no arguments are passed, an empty state is created, which is just a
    // shortcut for jQuery.bbq.pushState( {}, 2 ).
    // 
    // Usage:
    // 
    // > jQuery.bbq.removeState( [ key [, key ... ] ] );
    // 
    // Arguments:
    // 
    //  key - (String) One or more key values to remove from the current state,
    //    passed as individual arguments.
    //  key - (Array) A single array argument that contains a list of key values
    //    to remove from the current state.
    // 
    // Returns:
    // 
    //  Nothing.
    // 
    // Additional Notes:
    // 
    //  * Setting an empty state may cause the browser to scroll.

    jq_bbq.removeState = function (arr) {
        var state = {};

        // If one or more arguments is passed..
        if (arr !== undefined) {

            // Get the current state.
            state = jq_bbq_getState();

            // For each passed key, delete the corresponding property from the current
            // state.
            $.each($.isArray(arr) ? arr : arguments, function (i, v) {
                delete state[v];
            });
        }

        // Set the state, completely overriding any existing state.
        jq_bbq_pushState(state, 2);
    };

    // Event: hashchange event (BBQ)
    // 
    // Usage in jQuery 1.4 and newer:
    // 
    // In jQuery 1.4 and newer, the event object passed into any hashchange event
    // callback is augmented with a copy of the location.hash fragment at the time
    // the event was triggered as its event.fragment property. In addition, the
    // event.getState method operates on this property (instead of location.hash)
    // which allows this fragment-as-a-state to be referenced later, even after
    // window.location may have changed.
    // 
    // Note that event.fragment and event.getState are not defined according to
    // W3C (or any other) specification, but will still be available whether or
    // not the hashchange event exists natively in the browser, because of the
    // utility they provide.
    // 
    // The event.fragment property contains the output of <jQuery.param.fragment>
    // and the event.getState method is equivalent to the <jQuery.bbq.getState>
    // method.
    // 
    // > $(window).bind( 'hashchange', function( event ) {
    // >   var hash_str = event.fragment,
    // >     param_obj = event.getState(),
    // >     param_val = event.getState( 'param_name' ),
    // >     param_val_coerced = event.getState( 'param_name', true );
    // >   ...
    // > });
    // 
    // Usage in jQuery 1.3.2:
    // 
    // In jQuery 1.3.2, the event object cannot to be augmented as in jQuery 1.4+,
    // so the fragment state isn't bound to the event object and must instead be
    // parsed using the <jQuery.param.fragment> and <jQuery.bbq.getState> methods.
    // 
    // > $(window).bind( 'hashchange', function( event ) {
    // >   var hash_str = $.param.fragment(),
    // >     param_obj = $.bbq.getState(),
    // >     param_val = $.bbq.getState( 'param_name' ),
    // >     param_val_coerced = $.bbq.getState( 'param_name', true );
    // >   ...
    // > });
    // 
    // Additional Notes:
    // 
    // * Due to changes in the special events API, jQuery BBQ v1.2 or newer is
    //   required to enable the augmented event object in jQuery 1.4.2 and newer.
    // * See <jQuery hashchange event> for more detailed information.

    jq_event_special[str_hashchange] = $.extend(jq_event_special[str_hashchange], {

        // Augmenting the event object with the .fragment property and .getState
        // method requires jQuery 1.4 or newer. Note: with 1.3.2, everything will
        // work, but the event won't be augmented)
        add: function (handleObj) {
            var old_handler;

            function new_handler(e) {
                // e.fragment is set to the value of location.hash (with any leading #
                // removed) at the time the event is triggered.
                var hash = e[str_fragment] = jq_param_fragment();

                // e.getState() works just like $.bbq.getState(), but uses the
                // e.fragment property stored on the event object.
                e.getState = function (key, coerce) {
                    return key === undefined || typeof key === 'boolean'
            ? jq_deparam(hash, key) // 'key' really means 'coerce' here
            : jq_deparam(hash, coerce)[key];
                };

                old_handler.apply(this, arguments);
            };

            // This may seem a little complicated, but it normalizes the special event
            // .add method between jQuery 1.4/1.4.1 and 1.4.2+
            if ($.isFunction(handleObj)) {
                // 1.4, 1.4.1
                old_handler = handleObj;
                return new_handler;
            } else {
                // 1.4.2+
                old_handler = handleObj.handler;
                handleObj.handler = new_handler;
            }
        }

    });

})(jQuery, this);

/*!
* jQuery hashchange event - v1.2 - 2/11/2010
* http://benalman.com/projects/jquery-hashchange-plugin/
* 
* Copyright (c) 2010 "Cowboy" Ben Alman
* Dual licensed under the MIT and GPL licenses.
* http://benalman.com/about/license/
*/

// Script: jQuery hashchange event
//
// *Version: 1.2, Last updated: 2/11/2010*
// 
// Project Home - http://benalman.com/projects/jquery-hashchange-plugin/
// GitHub       - http://github.com/cowboy/jquery-hashchange/
// Source       - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.js
// (Minified)   - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.min.js (1.1kb)
// 
// About: License
// 
// Copyright (c) 2010 "Cowboy" Ben Alman,
// Dual licensed under the MIT and GPL licenses.
// http://benalman.com/about/license/
// 
// About: Examples
// 
// This working example, complete with fully commented code, illustrate one way
// in which this plugin can be used.
// 
// hashchange event - http://benalman.com/code/projects/jquery-hashchange/examples/hashchange/
// 
// About: Support and Testing
// 
// Information about what version or versions of jQuery this plugin has been
// tested with, what browsers it has been tested in, and where the unit tests
// reside (so you can test it yourself).
// 
// jQuery Versions - 1.3.2, 1.4.1, 1.4.2
// Browsers Tested - Internet Explorer 6-8, Firefox 2-3.7, Safari 3-4, Chrome, Opera 9.6-10.1.
// Unit Tests      - http://benalman.com/code/projects/jquery-hashchange/unit/
// 
// About: Known issues
// 
// While this jQuery hashchange event implementation is quite stable and robust,
// there are a few unfortunate browser bugs surrounding expected hashchange
// event-based behaviors, independent of any JavaScript window.onhashchange
// abstraction. See the following examples for more information:
// 
// Chrome: Back Button - http://benalman.com/code/projects/jquery-hashchange/examples/bug-chrome-back-button/
// Firefox: Remote XMLHttpRequest - http://benalman.com/code/projects/jquery-hashchange/examples/bug-firefox-remote-xhr/
// WebKit: Back Button in an Iframe - http://benalman.com/code/projects/jquery-hashchange/examples/bug-webkit-hash-iframe/
// Safari: Back Button from a different domain - http://benalman.com/code/projects/jquery-hashchange/examples/bug-safari-back-from-diff-domain/
// 
// About: Release History
// 
// 1.2   - (2/11/2010) Fixed a bug where coming back to a page using this plugin
//         from a page on another domain would cause an error in Safari 4. Also,
//         IE6/7 Iframe is now inserted after the body (this actually works),
//         which prevents the page from scrolling when the event is first bound.
//         Event can also now be bound before DOM ready, but it won't be usable
//         before then in IE6/7.
// 1.1   - (1/21/2010) Incorporated document.documentMode test to fix IE8 bug
//         where browser version is incorrectly reported as 8.0, despite
//         inclusion of the X-UA-Compatible IE=EmulateIE7 meta tag.
// 1.0   - (1/9/2010) Initial Release. Broke out the jQuery BBQ event.special
//         window.onhashchange functionality into a separate plugin for users
//         who want just the basic event & back button support, without all the
//         extra awesomeness that BBQ provides. This plugin will be included as
//         part of jQuery BBQ, but also be available separately.

(function ($, window, undefined) {
    '$:nomunge'; // Used by YUI compressor.

    // Method / object references.
    var fake_onhashchange,
    jq_event_special = $.event.special,

    // Reused strings.
    str_location = 'location',
    str_hashchange = 'hashchange',
    str_href = 'href',

    // IE6/7 specifically need some special love when it comes to back-button
    // support, so let's do a little browser sniffing..
    browser = $.browser,
    mode = document.documentMode,
    is_old_ie = browser.msie && (mode === undefined || mode < 8),

    // Does the browser support window.onhashchange? Test for IE version, since
    // IE8 incorrectly reports this when in "IE7" or "IE8 Compatibility View"!
    supports_onhashchange = 'on' + str_hashchange in window && !is_old_ie;

    // Get location.hash (or what you'd expect location.hash to be) sans any
    // leading #. Thanks for making this necessary, Firefox!
    function get_fragment(url) {
        url = url || window[str_location][str_href];
        return url.replace(/^[^#]*#?(.*)$/, '$1');
    };

    // Property: jQuery.hashchangeDelay
    // 
    // The numeric interval (in milliseconds) at which the <hashchange event>
    // polling loop executes. Defaults to 100.

    $[str_hashchange + 'Delay'] = 100;

    // Event: hashchange event
    // 
    // Fired when location.hash changes. In browsers that support it, the native
    // window.onhashchange event is used (IE8, FF3.6), otherwise a polling loop is
    // initialized, running every <jQuery.hashchangeDelay> milliseconds to see if
    // the hash has changed. In IE 6 and 7, a hidden Iframe is created to allow
    // the back button and hash-based history to work.
    // 
    // Usage:
    // 
    // > $(window).bind( 'hashchange', function(e) {
    // >   var hash = location.hash;
    // >   ...
    // > });
    // 
    // Additional Notes:
    // 
    // * The polling loop and Iframe are not created until at least one callback
    //   is actually bound to 'hashchange'.
    // * If you need the bound callback(s) to execute immediately, in cases where
    //   the page 'state' exists on page load (via bookmark or page refresh, for
    //   example) use $(window).trigger( 'hashchange' );
    // * The event can be bound before DOM ready, but since it won't be usable
    //   before then in IE6/7 (due to the necessary Iframe), recommended usage is
    //   to bind it inside a $(document).ready() callback.

    jq_event_special[str_hashchange] = $.extend(jq_event_special[str_hashchange], {

        // Called only when the first 'hashchange' event is bound to window.
        setup: function () {
            // If window.onhashchange is supported natively, there's nothing to do..
            if (supports_onhashchange) { return false; }

            // Otherwise, we need to create our own. And we don't want to call this
            // until the user binds to the event, just in case they never do, since it
            // will create a polling loop and possibly even a hidden Iframe.
            $(fake_onhashchange.start);
        },

        // Called only when the last 'hashchange' event is unbound from window.
        teardown: function () {
            // If window.onhashchange is supported natively, there's nothing to do..
            if (supports_onhashchange) { return false; }

            // Otherwise, we need to stop ours (if possible).
            $(fake_onhashchange.stop);
        }

    });

    // fake_onhashchange does all the work of triggering the window.onhashchange
    // event for browsers that don't natively support it, including creating a
    // polling loop to watch for hash changes and in IE 6/7 creating a hidden
    // Iframe to enable back and forward.
    fake_onhashchange = (function () {
        var self = {},
      timeout_id,
      iframe,
      set_history,
      get_history;

        // Initialize. In IE 6/7, creates a hidden Iframe for history handling.
        function init() {
            // Most browsers don't need special methods here..
            set_history = get_history = function (val) { return val; };

            // But IE6/7 do!
            if (is_old_ie) {

                // Create hidden Iframe after the end of the body to prevent initial
                // page load from scrolling unnecessarily.
                iframe = $('<iframe src="javascript:0"/>').hide().insertAfter('body')[0].contentWindow;

                // Get history by looking at the hidden Iframe's location.hash.
                get_history = function () {
                    return get_fragment(iframe.document[str_location][str_href]);
                };

                // Set a new history item by opening and then closing the Iframe
                // document, *then* setting its location.hash.
                set_history = function (hash, history_hash) {
                    if (hash !== history_hash) {
                        var doc = iframe.document;
                        doc.open().close();
                        doc[str_location].hash = '#' + hash;
                    }
                };

                // Set initial history.
                set_history(get_fragment());
            }
        };

        // Start the polling loop.
        self.start = function () {
            // Polling loop is already running!
            if (timeout_id) { return; }

            // Remember the initial hash so it doesn't get triggered immediately.
            var last_hash = get_fragment();

            // Initialize if not yet initialized.
            set_history || init();

            // This polling loop checks every $.hashchangeDelay milliseconds to see if
            // location.hash has changed, and triggers the 'hashchange' event on
            // window when necessary.
            (function loopy() {
                var hash = get_fragment(),
          history_hash = get_history(last_hash);

                if (hash !== last_hash) {
                    set_history(last_hash = hash, history_hash);

                    $(window).trigger(str_hashchange);

                } else if (history_hash !== last_hash) {
                    window[str_location][str_href] = window[str_location][str_href].replace(/#.*/, '') + '#' + history_hash;
                }

                timeout_id = setTimeout(loopy, $[str_hashchange + 'Delay']);
            })();
        };

        // Stop the polling loop, but only if an IE6/7 Iframe wasn't created. In
        // that case, even if there are no longer any bound event handlers, the
        // polling loop is still necessary for back/next to work at all!
        self.stop = function () {
            if (!iframe) {
                timeout_id && clearTimeout(timeout_id);
                timeout_id = 0;
            }
        };

        return self;
    })();

})(jQuery, this);